A method and apparatus for generating multiple levels of optical signals. A plurality of electrical currents is produced. The magnitudes of the electrical currents are independent of each other. Optical signals are produced using the electrical currents. Each optical signal has an amplitude corresponding to one of the multiple levels. The amplitudes of the optical signals corresponding to a level are adjustable by independently adjusting a respective electrical current. Amplitudes of optical signals corresponding to other levels may be adjusted independently.
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June 13, 2002
April 4, 2006
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